Apparatus for production of gas-permeable seamless pipes

Details Apparatus for production of gas-permeable seamless pipes Apparatus for production of gas-permeable seamless pipes

1975-12-02

1977-02-15

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

With foraminous or absorbent means for removal of vehicle or...

Vacuum means

425DIG60, 425371, 425403, B29C 1100, B29D 2300, B29J 500

Patent

active

040080242

ABSTRACT:
A gas-permeable seamless pipe structure formed in a pipe shape by a wet process comprising (A) 20 to 95% by weight of thermoplastic fibers and (B) 5 to 80% by weight of a component consisting of (a) 20 to 100% of other fibers being infusible at the fusing temperature of said thermoplastic fibers (A) or having a higher melting point than said thermoplastic fibers (A) and (b) 0 to 80% by weight of a void-containing particulate material having an apparent density of not more than 1 and an average particle size of 20 to 2,000 microns and being infusible at the fusing temperature of said thermoplastic fibers (A), said thermoplastic fibers (A) being bonded to the other component (B) as a result of heat fusing; a method for producing the pipe structure; and an apparatus for use in this method. The pipe structure has superior physical properties such as strength and hardness, good water resistance, light weight and superior gas-permeability.

REFERENCES:
patent: 2731699 (1956-01-01), Dubbs
patent: 2961043 (1960-11-01), Hicks
patent: 3748072 (1973-07-01), Whelan

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